Endress+Hauser COA451 Specifications
TI00368C/07/EN/14.20
71478863
2020-04-30
Products
Solutions Services
Technical Information
Cleanfit COA451
Manually operated retractable assembly for water,
wastewater and process media
Application
Cleanfit COA451 is a retractable assembly for oxygen sensors with a diameter of 40
mm in:
• Wastewater treatment plants:
• Oxygen control in activated sludge basins
• Treatment and monitoring of process water
• Water works:
• Status monitoring for drinking water
• Water quality monitoring in rivers, lakes or seas
• All industrial utilities:
• Oxygen control in biological treatment
• Treatment and monitoring of process water
• Fish farming:
Oxygen monitoring for optimum growth conditions
Your benefits
• One assembly for all applications: the 'one-for-all' principle optimizes inventory
management, accelerates project handling and simplifies life cycle management.
• Easy and safe maintenance: sensor servicing and cleaning without interrupting the
process.
• Robust design: process pressure up to 10 bar (145 psi), manual operation up to
2 bar (29 psi).
• Convenient, time-saving operation: rinse water connection enables cleaning
without having to remove the sensor from the process.
Table of contents
Function and system design ................... 3
Structure of the assembly ........................ 3
Structure of the sensor holder ..................... 3
Measuring system ............................. 5
Installation ................................ 5
Orientation ................................. 5
Installation instructions ......................... 5
Environment ............................... 6
Ambient temperature .......................... 6
Process ................................... 6
Medium temperature ........................... 6
Medium pressure ............................. 6
Pressure-temperature ratings ..................... 6
Cleanfit COA451
Mechanical construction ...................... 7
Dimensions ................................. 7
Certificates and approvals ................... 11
CE/PED ................................... 11
Ordering information ....................... 11
Product page ............................... 11
Product Configurator .......................... 11
Scope of delivery ............................. 12
Accessories ............................... 12
Device-specific accessories ...................... 12
Service-specific accessories ...................... 14
Accessory kits ............................... 14
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Structure of the assembly
Function and system design
The assembly is operated manually.
The vent cock or the the rinse connections (if used) are in open contact with the medium in the
measuring position and when the assembly is retracted/inserted, and are therefore exposed to
the process pressure.
The vent cock or the rinse connections (if used) must be closed when inserting/retracting the
assembly.
In the service position (sensor moved back into the assembly as far as possible and ball valve closed),
the assembly is sealed from the process by the ball valve.
This means that cleaning, calibration or sensor replacement can be performed without interrupting
the process.
The assembly can be inserted/retracted manually at process conditions up to a process pressure of
approx. 2 bar (29 psi).
A0038438
1 Assembly in operational state (ball valve open)
1 Bracket for sensor holder
2 Sensor holder
3 Bayonet lock
4 Securing screws
5 Grease nipple
6 Ball valve/valve for venting or rinse connection
7 Process connection
8 Retraction pipe
9 Hand lever for opening/closing the ball valve
10 Handles
An additional rinse chamber valve can be mounted in the locking screw opposite the vent valve.
Structure of the sensor holder
The sensor holder is used to position the sensor correctly in order to ensure correct measuring
accuracy.
If the sensor is not positioned correctly, the ball valve may be blocked or the sensor may be located in
the dead space as a result.
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2 Short sensor holder
1 Mounting position of the bayonet nut to hold the relevant sensor
2 Grooves of the safety rings to mount the bayonet nut
Cleanfit COA451
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3 Mounting position of the bayonet nut for CUS65D or COS51D
The name indicated on the holder serves as a mounting aid. The bayonet nut covers over the
marking for the selected sensor position.
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Measuring system
4 Orientations, schematic
1 Sensor (see Accessories)
2 Transmitter
3 Retractable assembly
4 Direction of flow
The orientation depends on the sensor head. Pay attention to the Operating Instructions for the
relevant sensor. An inclination of at least 15° is recommended for amperometric sensors
Make sure to avoid a siphon effect at the rinse chamber outlet. The inflow to the rinse chamber
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is always from below.
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Orientation
Installation
The following diagram shows different installation positions in pipes, and indicates whether they are
permitted or not.
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5 Schematic of installation positions and orientations
Ideally, the assembly should be mounted in an ascending pipe. Installation in a horizontal pipe is
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also possible.
• Install the sensor in places with uniform flow conditions.
• Do not install the sensor in places where air may collect or foam bubbles form or where suspended
particles may settle.
• Avoid installation in the down pipe.
• Avoid fittings downstream from pressure reduction stages which can lead to outgassing.
Installation instructions
Install the assembly in places with uniform flow conditions. The minimum pipe diameter is DN
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80.
The installation instructions depend on the sensor used.
Detailed installation instructions are provided in both the Technical Information and in the
Operating Instructions for the particular sensor.
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